Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 13/96] seccomp: Fix setting loaded filter count during TSYNC | Date | Mon, 16 Aug 2021 15:01:23 +0200 |
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From: Hsuan-Chi Kuo <hsuanchikuo@gmail.com>
commit b4d8a58f8dcfcc890f296696cadb76e77be44b5f upstream.
The desired behavior is to set the caller's filter count to thread's. This value is reported via /proc, so this fixes the inaccurate count exposed to userspace; it is not used for reference counting, etc.
Signed-off-by: Hsuan-Chi Kuo <hsuanchikuo@gmail.com> Link: https://lore.kernel.org/r/20210304233708.420597-1-hsuanchikuo@gmail.com Co-developed-by: Wiktor Garbacz <wiktorg@google.com> Signed-off-by: Wiktor Garbacz <wiktorg@google.com> Link: https://lore.kernel.org/lkml/20210810125158.329849-1-wiktorg@google.com Signed-off-by: Kees Cook <keescook@chromium.org> Cc: stable@vger.kernel.org Fixes: c818c03b661c ("seccomp: Report number of loaded filters in /proc/$pid/status") Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- kernel/seccomp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/seccomp.c +++ b/kernel/seccomp.c @@ -511,7 +511,7 @@ static inline void seccomp_sync_threads( smp_store_release(&thread->seccomp.filter, caller->seccomp.filter); atomic_set(&thread->seccomp.filter_count, - atomic_read(&thread->seccomp.filter_count)); + atomic_read(&caller->seccomp.filter_count)); /* * Don't let an unprivileged task work around
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